GBT1771-91标准（英文版）.doc

Standard of People’s Republic of China
Paints and Varnishes –
Determination of Resistance to Neutral Salt Spray
GB/T 1771-91
Superseded GB1771-79
This standard is identical to the international standard ISO 7253 – 1984 Paints and Varnishes – Determination of Resistance to Neutral Salt Spray.
Subject Contents and Application Scope
This standard defines the method for the measurement of coating resistance to the neutral salt spray.
The methods specified in this standard may be taken as the inspection means for the paints and varnishes system quality.
Normative Reference
GB 1266 Sodium Chloride
GB 1764 Paint Film Thickness Measurement Method
GB 1765 Paint Film Preparation for Measurement of Wet Heat Resistance, Salt Fog Resistance, and Weather Resistance (Manual Accelerated Method)
GB 3186 Sampling of Coated Products
GB 6682 Laboratory Water Specification
GB 9271 Paint and Varnish - Standard Specimen
GB 9278 Status Adjustment of Coated Specimen and Test Temperature and Humidity
GB 9286 Paint and Varnish – Grid Test for Paint Film
Test Solvent
The test solvent should be prepared in such manner to dissolve the chemically pure sodium chloride that met with GB1266 into the grade 3 water that met with GB 6682, with the concentration of 50±10g/L1].
The pH measurement of the test solvent () at 25ºC should be ~ when measured with pH meter (with pH precisio